Abstract

A considerable threat facing both estuary rivers and aquifers is seawater intrusion. Published articles emphasize modelling the intrusion, either mathematically or numerically. using software, which lacks the capacity for introducing a hydrodynamic solution that would mitigate the intrusion within fresh water. This paper presents a proposed solution for seawater intrusion. The solution is based on using contractions. To introduce the solution, COMSOL software is used to simulate the intrusion within a hypothetical canal of 10 km length, 1 km width, and an 80% contraction ratio. The simulation used three different scenarios of conditions under four different geometries of contractions, in addition to a default canal. The results show that the best geometries are the double semicircles and the wide contraction. For a 10 km canal length, the range of (10% - 20%) of effecting concentration will only intrude for just 0.75 km beyond the contraction.